Specifications and Selection for Temperature and Pressure

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F-SF
Specifications and Selection for
Temperature and Pressure
Protection of Water Heaters
and Hot Water Storage Tanks
NEWS
The following will enable you to select the proper size Watts Temperature and Pressure Relief Valves for water heaters, based on the listed temperature relieving capacity exceeding
that of the heater BTU input rating. All valves are constructed, tested and rated under ANSI
Z21.22 “Relief Valves for Hot Water Supply Systems” and have a discharge capacity based
on temperature steam ratings.
For Heaters Under 200,000 BTU Per Hour Input Rating:
Type No. †
Model
Inlet x Outlet
Size (In.)
CSA
Temp. Steam Rating
BTU/HR
1L-2
1XL-4
1XL-8
M7
M7
M7
12
12
15,000
15,000
15,000
}
10L-2
100XL
100XL-8
M7
M7
M7
34
⁄ M x 3⁄ 4 F
3 ⁄ 4 M x 3⁄ 4 F
3⁄ 4 M x 3⁄ 4 F
80,000
100,000
100,000
SL100XL
L100XL-3
LL100XL-2.5
LLL100XL
M7
M7
M7
M7
34
⁄ M x 3⁄ 4 F
⁄ M x 3⁄ 4 F
3 ⁄ 4 M x 3⁄ 4 F
3⁄ 4 M x 3⁄ 4 F
100,000
100,000
100,000
100,000
40L-3
LL40XL
LLL40XL
40XL-5
40XL-8
M15
M15
M15
M15
M15
34
180,000
200,000
200,000
200,000
200,000
140S-3
140X-5
140X-8
M15
M15
M15
}
⁄ M x 1⁄ 2 F
⁄ M x 1⁄ 2 F
1 ⁄ 2 M x 1⁄ 2 F
34
⁄ M x 3⁄ 4 F
⁄ M x 3⁄ 4 F
3⁄ 4 M x 3⁄ 4 F
3⁄ 4 M x 3⁄ 4 F
3⁄ 4 M x 3⁄ 4 F
34
34
34
⁄ F x 3⁄ 4 F
⁄ F x 3⁄ 4 F
3 ⁄ 4 F x 3⁄ 4 F
180,000
200,000
200,000
1⁄2"
CSA
Ratings
Must be
Used for
1⁄2" & 3⁄4"
T&P Valves
3⁄4"
†Suffix = length of thermostat in inches. Example: IL-2 = extension length 2".
For Heaters Over 200,000 BTU Per Hour Input Rating:
40L-2
40XL-4
40XL-7
LL40XL
M15
M15
M15
M15
1Mx1F
1Mx1F
1Mx1F
1Mx1F
450,000
500,000
500,000
500,000
140S-3
140X-6
140X-9
M15
M15
M15
1Fx1F
1Fx1F
1Fx1F
570,000
670,000
670,000
*N240X-6
*N240X-9
*N241X-5
*N241X-8
M15
M15
M15
M15
1Fx1F
1Fx1F
1 1⁄ 4 M x 1 F
1 1⁄ 4 M x 1 F
730,000
730,000
730,000
730,000
*340-3
*340X-8
M15
M15
11⁄2 F x 11⁄2 F
11⁄2 F x 11⁄2 F
1,150,000
1,150,000
*342-3
*342X-8
M15
M15
2 M x 1 1⁄ 2 F
2 M x 1 1⁄ 2 F
1,150,000
1,150,000
*Standardly furnished with stainless steel thermostat tube.
These ratings are the result of improved and advanced designs incorporating new higher lift
thermostatic elements as well as the ANSI Z21.22 Listing Requirements.
See back
page for
ASME
ratings of
T&P Valves
1" & larger
Valve Specifications to Meet All Latest Applicable Standards
and Established Requirements
To meet CSA, UL, or FHA water heater standard safety requirements, a temperature and
pressure relief valve, constructed and located in conformance with current "ANSI
Z21.22 Relief Valves for Hot Water Supply Systems”, shall be installed on all water heaters at time of installation. The temperature sensing element shall be immersed in the
water within the top 6” of the tank.
CSA Interpretation of Current ANSI Z21.10.1 Gas Storage Water Heater
Standard:
"That portion of the marking which provides, ‘a listed temperature and pressure relief valve shall be installed at the time of the installation of the heater,’
shall be considered by the CSA to be mandatory and not optional with the
installer.” “Compliance with this instruction is deemed by CSA to be a required step for the safe installation and use of a water heater as intended by
Z21.10.1 1966.
Watts
⁄ " 100XL
34
UL Standards require the following heater marking:
“Install temperature and pressure protective equipment required by local
codes, but not less than a combination temperature and pressure relief valve
certified as meeting requirements of ANSI Z21.22 by a nationally recognized
testing laboratory that maintains periodic inspection of production of listed
equipment or materials.”
FHA No. 300 Minimum Property Standards Sec. 1005-4.1
All direct-fired, automatic storage-type water heaters shall be provided, at the
time of installation, with a reseating type temperature and pressure relief
valve constructed, listed and installed in accordance with ANSI Z21.22. This
requirement is in addition to the energy cutoff device installed by the heater
manufacturer and which conforms to the labeling requirements of the appropriate CSA and UL standards.
Correct Installation of T&P Relief Valves
Use short or standard length thermostat.
Vertical discharge line must be installed
with its direction downward.
Insulation
Max. 6"
(152mm)
Use Standard or extra length
extension thermostat
Cold
T&P Relief Valve
Max.
6"
(152mm)
“Alternate” Only when the
tappings are not provided
Use Standard or extra length
extension thermostat.
Hot
Max.
6"
(152mm)
Discharge Line
FOR INTERNAL FLUE HEATERS
Discharge Line
Use extra length extension thermostat to extend into water storage tank.
For Heaters with
Direct Top Tapping
Hot
Direct Side Tapping
FOR EXTERNAL FLUE HEATERS
Insulation
Insulation
Discharge
Line
Vertical discharge line must be installed with its direction downward.
IMPORTANT
A relief valve functions, in an emergency, by discharging water. Therefore, it is essential that a discharge line be piped from the valve in order
to carry the overflow to a safe place of disposal. The drain pipe must be the same size as the valve outlet, and must pitch downward from the
valve and terminate at least 6” above a drain where discharge will be clearly visible.
T&P Relief Valve Ratings
CSA Temperature Steam Rating
(See Page 1)
ASME Pressure Steam Rating
(See Page 4)
Temperature Water Rating
(See Page 4)
General Recommendations
1. For gas, electric or oil storage water heaters
Watts 3⁄4" 40XL
34
⁄ " and 1" Series
40, 3⁄4" Series
140, Model
M15, 1L-2, 1XL
Series and Series
100XL feature a
thermostat with a
special thermobonded
(nonmetalic)
protective coating.
This feature
retards the
accumulation of
mineral deposits
created by adverse
water conditions.
Thermo-Bonded (non-Metallic) Coating
3.
NOTE - Temperature Water Rating at 210°F: Where the BTU heater input exceeds available
CSA test ratings, larger size valves 1" and above have an in built temperature water rating
capacity at 210°F, as shown on rear page. However, the stated temperature water rating
should only be used where approved and understood to be conditional that there must be
no less than 30 lbs. supply pressure available to the water heater during any period of overheating discharge. Otherwise, the valves would not be responsible for adequate protection
of heater BTU input installations in excess of the CSA temperature steam ratings.
WARNING: Following installation, the valve lever MUST be operated AT LEAST ONCE A YEAR by
the water heater owner to ensure that waterways are clear. Certain naturally occurring mineral deposits may adhere to the valve, blocking waterways, rendering it inoperative. When the lever is operated, hot water will discharge if the waterways are clear. PRECAUTIONS MUST BE TAKEN TO AVOID
PERSONAL INJURY FROM CONTACT WITH HOT WATER AND TO AVOID PROPERTY DAMAGE. BEFORE operating lever, check to see that a discharge line is connected to the valve, directing the flow of
hot water from the valve to a proper place of disposal. If no water flows when the lever is operated,
replacement of the valve is required. TURN THE WATER HEATER "OFF" (see instruction manual) AND
CALL A PLUMBER IMMEDIATELY.
This device is designed for emergency safety relief and shall not be used as an operating control. A
relief valve functions, in an emergency, by discharging water. Therefore, it is essential that a discharge
line be piped from the valve in order to carry the overflow to a safe place of disposal. The discharge
line must be same size as the valve outlet and must pitch downward from the valve and terminate at
least 6” above a drain where any discharge will be clearly visible.
WARNING: REINSPECTION OF T&P RELIEF VALVES: Temperature and Pressure Relief Valves should
be inspected AT LEAST ONCE EVERY THREE YEARS, and replaced, if necessary, by a licensed
plumbing contractor or qualified service technician, to ensure that the product has not been affected by
corrosive water conditions and to ensure that the valve and discharge line have not been altered or
tampered with illegally. Certain naturally occurring conditions may corrode the valve or its components
over time, rendering the valve inoperative. Such conditions can only be detected if the valve and its
components are physically removed and inspected. Do not attempt to conduct an inspection on your
own. Contact your plumbing contractor for a reinspection to assure continuing safety.
WARNING: FAILURE TO REINSPECT THIS VALVE AS DIRECTED COULD RESULT IN UNSAFE TEMPERATURE OR PRESSURE BUILDUP WHICH CAN RESULT IN SERIOUS INJURY OR DEATH AND/OR SEVERE
PROPERTY DAMAGE.
Watts 3⁄4" 140XL
Stainless Steel Thermostat Tube
2.
under 200,000 BTU/hr. rating and for compliance with any applicable water heater labeling requirements: Use 3⁄4" T&P Valves
tested under ANSI Z21.22 with ratings as
certified and listed by CSA.
For gas or oil-fired storage water heaters
between 200,000 and 730,000 BTU/hr.
rating; and for compliance with any applicable water heater labeling requirements:
Use 1" and over T&P valves tested under
ANSI Z21.22 with ratings as certified and
listed by CSA.
For ASME installations of gas or oil-fired
hot water supply boilers heating domestic
water for a storage tank over 730,000 BTU
output; and for ASME installations of
steam coil storage water heaters: Use 11⁄2"
and over, T&P valves tested under ANSI
Z21.22 with ratings as certified and listed
by CSA.
1" Series 140
Model M15,
Series N240,
N241 Model M2
and Series 340,
342 Model M15
are standardly
furnished with
stainless steel
thermostat tube.
▼
The use of a temperature water rating discharge capacity for 1”
and larger inlet and outlet T&P relief valves is specified in ANSI
Z21.22. Therefore, Watts certifies these 1” and larger valves
also have a temperature water rating based on 1,250 BTU for
each gallon of water discharged at 30 lbs. working pressure
with a maximum temperature of 210°F. They are ASME pressure
steam rated at least equal to their temperature water rating as
indicated in the specifications following:
Type
No.
IMPORTANT NOTE - Watts Temperature Water Rating 210°F: The
stated temperature water rating should only be used where approved
and understood to be conditional that there must be no less than 30
lbs. supply pressure available to the water heater. Otherwise, the
valves would not be responsible for adequate protection of heater
BTU input installations in excess of the CSA temperature steam ratings given on page 1 of this folder.
These ratings may be used for T&P valves 1” and larger. See note.
Watts Temp.
Water Rating
210°F
@75 psi set pressure
†ASME Pressure
Steam Rating
†ASME Pressure
Steam Rating
†ASME Pressure
Steam Rating
†ASME Pressure
Steam Rating
Model
Inlet x Outlet
Size (In.)
40L-2
40XL-4
40XL-7
LL40XL
M15
M15
M15
M15
1Mx1F
1Mx1F
1Mx1F
1M x 1F
800,000
1,000,000
1,000,000
1,000,000
1,155,000
1,155,000
1,155,000
1,155,000
1,481,000
1,481,000
1,481,000
1,481,000
1,808,000
1,808,000
1,808,000
1,808,000
2,134,000
2,134,000
2,134,000
2,134,000
*140S-3
*140X-6
*140X-9
M15
M15
M15
1Fx1F
1Fx1F
1Fx1F
1,200,000
1,500,000
1,500,000
1,670,000
1,670,000
1,670,000
2,140 000
2,140,000
2,140,000
2,610,000
2,610,000
2,610,000
3,085,000
3,085,000
3,085,000
*N240X-6
*N240X-9
M15
M15
1Fx1F
1Fx1F
2,000,000
2,000,000
2,195,000
2,195,000
2,817,000
2,817,000
3,438,000
3,438,000
4,059,000
4,059,000
*N241X-5
*N241X-8
M15
M15
1 1⁄ 4 M x 1 F
1 1⁄ 4 M x 1 F
2,000,000
2,000,000
2,195,000
2,195,000
2,817,000
2,817,000
3,438,000
3,438,000
4,059,000
4,059,000
*340-3
*340X-8
M15
M15
1 1⁄ 2 F x 1 1⁄ 2 F
1 1⁄ 2 F x 1 1⁄ 2 F
3,000,000
3,000,000
3,450,000
3,450,000
4,426,000
4,426,000
5,403,000
5,403,000
6,379,000
6,379,000
*342-3
*342X-8
M15
M15
2 M x 1 1⁄ 2 F
2 M x 1 1⁄ 2 F
3,000,000
3,000,000
3,450,000
3,450,000
4,426,000
4,426,000
5,403,000
5,403,000
6,379,000
6,379,000
@100 psi set pressure @125 psi set pressure
@150 psi set pressure
*Standardly furnished with stainless steel thermostat tube.
†These ASME capacities are steam pressure ratings, and do not reflect the CSA temperature relieving capacity of the valves for
selection purposes.
Watts 3⁄4"
No. 140S
or 140X
Watts 3⁄4” 40L
Watts 3⁄4” 40XL
Watts 3⁄4” 10L
Watts 3⁄4” 100XL
Watts 1" 40L
or 40XL
Watts 1" 140S
or 140X
Watts 1" N240X
Watts 11⁄4" N241X
Watts 11⁄2" 340
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com
F-SF-0022
©Watts Regulator Co., 1996
Printed in U.S.A.
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